feat: foundry and devcontainer (#111)

## Description

This PR:

1. Adds [foundry](https://getfoundry.sh/) configuration for the
contracts.
2. Configures the solidity compiler for foundry to replicate that
currently used within the contracts.
3. Adds a devcontainer containing foundry and node (for still running
hardhat during the migration phase).
4. Configures a VS Code environment for solidity development.

## Test Plan

1. Observe CI/CD continues to pass.

## Related Issues

Closes #99
Closes #98

---------

Co-authored-by: Federico Giacon <[email protected]>

.devcontainer/devcontainer.json

@@ -0,0 +1,15 @@
+{
+	"name": "Foundry + Node",
+	"image": "mcr.microsoft.com/devcontainers/base:0",
+	"features": {
+		"ghcr.io/nlordell/features/foundry": {},
+		"ghcr.io/devcontainers/features/node:1": {}
+	},
+	"customizations": {
+		"vscode" : {
+			"extensions": [
+				"JuanBlanco.solidity"
+			]
+		}
+	}
+}

.gas-snapshot

@@ -0,0 +1 @@
+TestNoOp:test_noOp() (gas: 122)

.github/workflows/gas.yml

@@ -0,0 +1,53 @@
+name: Gas
+
+on:
+  pull_request:
+    paths:
+      - '**.sol'
+      - '**.yml'
+      - '**.toml'
+      - 'lib/**'
+      - '.gitmodules'
+      - '.gas-snapshot'
+  push:
+    branches:
+      - main
+    paths:
+      - '**.sol'
+      - '**.yml'
+      - '**.toml'
+      - 'lib/**'
+      - '.gitmodules'
+      - '.gas-snapshot'
+
+env:
+  FOUNDRY_PROFILE: ci
+
+jobs:
+  gas:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - uses: actions/setup-node@v4
+      - id: yarn-cache
+        run: echo "dir=$(yarn cache dir)"  >> "$GITHUB_OUTPUT"
+      - uses: actions/cache@v4
+        with:
+          path: ${{ steps.yarn-cache.outputs.dir }}
+          key: yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            yarn-
+      - run: yarn --frozen-lockfile
+
+      - name: Install Foundry
+        uses: foundry-rs/foundry-toolchain@v1
+        with:
+          version: nightly
+
+      - name: Check gas snapshots
+        run: forge snapshot --check
+        # TODO: remove failure allowance once foundry migration is complete
+        continue-on-error: true

.github/workflows/test.yml

@@ -0,0 +1,62 @@
+name: Test
+
+on:
+  workflow_dispatch:
+  pull_request:
+    paths:
+      - '**.sol'
+      - '**.yml'
+      - '**.toml'
+      - 'lib/**'
+      - '.gitmodules'
+  push:
+    branches:
+      - main
+    paths:
+      - '**.sol'
+      - '**.yml'
+      - '**.toml'
+      - 'lib/**'
+      - '.gitmodules'
+
+env:
+  FOUNDRY_PROFILE: ci
+
+jobs:
+  test:
+    strategy:
+      fail-fast: true
+
+    name: Foundry project
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - uses: actions/setup-node@v4
+      - id: yarn-cache
+        run: echo "dir=$(yarn cache dir)"  >> "$GITHUB_OUTPUT"
+      - uses: actions/cache@v4
+        with:
+          path: ${{ steps.yarn-cache.outputs.dir }}
+          key: yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            yarn-
+      - run: yarn --frozen-lockfile
+
+      - name: Install Foundry
+        uses: foundry-rs/foundry-toolchain@v1
+        with:
+          version: nightly
+
+      - name: Run Forge build
+        run: |
+          forge --version
+          forge build --sizes
+        id: build
+
+      - name: Run Forge tests
+        run: |
+          forge test -vvv
+        id: test

.gitignore

@@ -9,3 +9,15 @@ yarn-error.log
 *.tgz
 state.json
 .mocharc.json
+
+# Compiler files
+cache/
+out/
+
+# Ignores development broadcast logs
+!/broadcast
+/broadcast/*/31337/
+/broadcast/**/dry-run/
+
+# Dotenv file
+.env

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "lib/forge-std"]
+	path = lib/forge-std
+	url = https://github.com/foundry-rs/forge-std

.vscode/settings.json

@@ -0,0 +1,7 @@
+{
+  "solidity.packageDefaultDependenciesDirectory": ["node_modules", "lib"],
+  "[solidity]": {
+    "editor.defaultFormatter": "JuanBlanco.solidity"
+  },
+  "solidity.compileUsingRemoteVersion": "v0.7.6+commit.7338295f",
+}

foundry.toml

@@ -0,0 +1,10 @@
+[profile.default]
+src = "src"
+out = "out"
+libs = ["node_modules", "lib"]
+
+# Compiler settings
+solc = "0.7.6"
+via_ir = false
+optimizer = true
+optimizer_runs = 1000000

test/TestNoOp.sol

@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+pragma solidity ^0.7.6;
+
+/// @dev No-op contract for start of forgifying contracts. Delete this!
+contract TestNoOp {
+    function test_noOp() external pure {}
+}